[Bug other/63426] [meta-bug] Issues found with -fsanitize=undefined

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
Bug 63426 depends on bug 63397, which changed state.

Bug 63397 Summary: signed integer overflows in ira.c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63397

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED